Question

Tìm x
a)x^2 -4x +6 =0
b) 4x^2 + 4x - 7 =0

Ai làm nhanh mình tick cho

Answer 1

aを見つける= 175度はどれくらい尋ねるaを見つける= 175度はどれくらい尋ねる

Answer 2

b. \(4x^2+4x-7=0\)

\(\Leftrightarrow\left(2x\right)^2+2.2x+1-8=0\)

\(\Leftrightarrow\left(2x+1\right)^2-8=0\)

\(\Leftrightarrow\left(2x+1-\sqrt{8}\right)\left(2x+1+\sqrt{8}\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}2x+1-\sqrt{8}=0\\2x+1+\sqrt{8}=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=\frac{\sqrt{8}-1}{2}\\x=\frac{-\sqrt{8}-1}{2}\end{cases}}\)

k mình nha bn <3 thanks nhìu hen